64640311 has 2 divisors, whose sum is σ = 64640312. Its totient is φ = 64640310.

The previous prime is 64640287. The next prime is 64640339. The reversal of 64640311 is 11304646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64640311 - 2¹³ = 64632119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64640011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32320155 + 32320156.

It is an arithmetic number, because the mean of its divisors is an integer number (32320156).

Almost surely, 2^64640311 is an apocalyptic number.

64640311 is a deficient number, since it is larger than the sum of its proper divisors (1).

64640311 is an equidigital number, since it uses as much as digits as its factorization.

64640311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 64640311 is about 8039.9198379088. The cubic root of 64640311 is about 401.3295570487.

Adding to 64640311 its reverse (11304646), we get a palindrome (75944957).

The spelling of 64640311 in words is "sixty-four million, six hundred forty thousand, three hundred eleven".